What does the "__get__" descriptor do in this Python code?

Question

What can you say about the `__get__` descriptor in the `TopClass` class below?

```python
class TopClass:
    def __init__(self):
        self.instance = None

def __get__(self, instance, cls=None):
        self.instance = instance
        return self

def request_data(self):
        return True

class MainClass:
    top_class = TopClass()
```

Accepted Answer

It allows access to an instance of `TopClass` by linking it to an instance of MainClass

Answer

It automatically executes the `request_data` method

Answer

It creates an instance of `TopClass` with each call

Answer

It initializes a new object of the `MainClass`

Question from the Python test